Papal infallibility was dogmatically defined by the First Vatican Council in 1870. This doctrine states that the Pope is preserved from error when he solemnly defines a doctrine concerning faith or morals.

“Ex cathedra” is a Latin term that means “from the chair.” In the context of the Roman Catholic Church, it refers to the Pope’s authority to make infallible declarations on matters of faith and morals when he speaks in his official capacity as the Bishop of Rome. When the Pope speaks ex cathedra, it is believed that he is guided by the Holy Spirit and is free from error in his teachings.

No such dogma exists in any form in Orthodox Christianity. Clearly a modern Afterthought of the Western Latin Church.